grep a file, but show several surrounding lines?

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I would like to grep for a string, but also show the preceding five lines and the following five lines as well as the matched line. How would I be able to do this?

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For BSD or GNU grep you can use -B num to set how many lines before the match and -A num for the number of lines after the match.

grep -B 3 -A 2 foo README.txt

If you want the same number of lines before and after you can use -C num.

grep -C 3 foo README.txt

This will show 3 lines before and 3 lines after.

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